// SPDX-FileCopyrightText: 1998, 2000 Free Software Foundation, Inc.
// SPDX-License-Identifier: GPL-2.0-or-later

/* Symbol concatenation utilities.

   Copyright (C) 1998, 2000 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef SYM_CAT_H
#define SYM_CAT_H

#if defined(__STDC__) || defined(ALMOST_STDC) || defined(HAVE_STRINGIZE)
#define CONCAT2(a, b)       a##b
#define CONCAT3(a, b, c)    a##b##c
#define CONCAT4(a, b, c, d) a##b##c##d
#define STRINGX(s)          #s
#else
/* Note one should never pass extra whitespace to the CONCATn macros,
   e.g. CONCAT2(foo, bar) because traditonal C will keep the space between
   the two labels instead of concatenating them.  Instead, make sure to
   write CONCAT2(foo,bar).  */
#define CONCAT2(a, b)       a /**/ b
#define CONCAT3(a, b, c)    a /**/ b /**/ c
#define CONCAT4(a, b, c, d) a /**/ b /**/ c /**/ d
#define STRINGX(s)          "s"
#endif

#define XCONCAT2(a, b)       CONCAT2(a, b)
#define XCONCAT3(a, b, c)    CONCAT3(a, b, c)
#define XCONCAT4(a, b, c, d) CONCAT4(a, b, c, d)

/* Note the layer of indirection here is typically used to allow
   stringification of the expansion of macros.  I.e. "#define foo
   bar", "XSTRING(foo)", to yield "bar".  Be aware that this only
   works for __STDC__, not for traditional C which will still resolve
   to "foo".  */
#define XSTRING(s) STRINGX(s)

#endif /* SYM_CAT_H */
